YourPay is a PHP class that can be used to submit WorldPay transactions through a WorldPay account without the very impersonal payment pages provided by the said company. This class will submit the user's credit card details in real-time and return either "Authorise" or "Decline" according to the response.

Open Systems Accounting Software (OSAS) is an accounting and business
management system. It is designed to be easy to learn and use. It is
best suited for companies ranging in size from small companies with 12
users or less to mid-market companies. It comes with many modules for
accounting, distribution, and reporting.

myMoney-go-round puts cashflow forecasting and budget
planning tools into the hands of the ordinary person,
enabling people to easily check for losses if they need to,
and to make more of their money otherwise.

PHPTab is a simple Web application that
allows a small group of people who know and
trust each other to track how much they owe
each other and for what. It supports one-to-
one payments as well as one-to-many
payments in any fixed ratio.

OneMaxx is an integrated suite of 4GL ERP systems, each addressing a specific business need. It offers multi-company, multi-currency, multi-lingual, multi-platform, and multi-client functionality with multiple deployment options.

Sigma Expense is an expense accounting Web
application. It allows road warriors to log in and
report their expenses in order to obtain refunds.
The program lets administrators set up a
validation workflow. Data can be exported in XML
format, and some filters already exist to import
the transactions into existing accounting systems
such as SunSystems. It works on top of a Tomcat
application server and has been tested with the
Sun JVM and Blackdown.